Digg is a website which offers users a way to discover and share content from anywhere on the internet by submitting links and stories and voting and commenting on submitted links and stories.
The site's cornerstone function is allowing users to vote stories up and down, respectively called "digging" and "burying". Many stories get submitted every day, but merely the most dugg stories appear on the front page. Only registered users can post, comment and vote.
Articles are submitted by category, being its debut place the Upcoming section. As well as its comments, they have a count of points received. For every user who votes up or down, the count goes up or down by an increment of one. They may vote on as many articles and comments as they want, only once per article/comment. When a submission has earned a critical mass of diggs, it becomes “popular” and jumps to the homepage in its category. If it becomes one of the most popular, it qualifies as a “Top 10”. If a submission does not receive enough diggs within a certain time period, it eventually falls out of the Upcoming section.
The promotion and burying of stories is managed by an algorithm developed by Digg. There is no hard number of diggs/buries to promote or remove a story. It is based on a sliding scale that takes several factors into consideration, such as number of diggs, reports, time of day, topic submitted to, digging/burying diversity, etc.
The homepage is category-customizable by the user. Comments are ordered by rank or date, also both positive and negative points threshold can be set for displaying them.
Friends can be added to a user's account to see what they are doing. Friends' activity is a running list of their actions within votes, comments, submissions, etc.
Lessons from Digg
- Bipolar thresholds.
- Simple scoring system.
- Customizable homepage.
- Friends' activity.
Discussion in relation to Metagovernment
Would be interesting to know the exact algorithm. Is it available?